I've see nthis pic before, and the thing that always got me was that it appears the rear wheel is still turning?? Did someonw just crawl off, swim to safety, and let it run out gas while getting a tow rope?

Enquiring minds want to know..............

I think it is an illusion.
muddy chain- looks like it is blurred, but really just mudcovered
muddy rocks- looks like churning water and mud around rear tire, but just muddy rocks.

I could be wrong.

__________________"It's not a death machine, Mom, it's a LIFE machine" - a motorcyclist